Free Shipping on ALL Products
camera reviewsbest cameraslens reviewsphotography tipscamera forumvideo toursphotography bookssupport me
It is currently Sat Dec 20, 2014 7:27 pm

All times are UTC




Post new topic Reply to topic  [ 9 posts ] 
Author Message
PostPosted: Thu Mar 06, 2008 12:46 pm 
Ok , in another forum I seen some decent pictures of the The Orion Nebula that the user took by positionig his tripod pointing into the eyepiece of a Celestron C6R......
My question is... on Ebay (i know..i know...) there is a Telesope with 25x,50x and 75x settings with an attachment for a DSLR.... would it work? cause his photos seem to look ok.... (see below quote)

Image


I'm embarrassed to say, I don't know the details on the telescope. A buddy of mine is an avid astronomy buff, and I tagged along last night on a start gazing party. All I can say is, it looked big enough to shot someone out the other end. For the first shot, I just piggy-backed on the telescope. On the second one, I positioned my tripod so that the lens was pointed directly into the eyepiece of the telescope. I was really just playing around, trying to learn how to get a good shot. I'm hoping to go back up with him next weekend, and maybe get a better shot or two.

Most of the shots are at ISO 1600, for about a minute exposure. I stacked about 5 1-minute exposures to reduce some of the noise caused by the high ISO.

Glad you all like the shots.



Image

Image


Top
  
 
PostPosted: Thu Mar 06, 2008 2:25 pm 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9833
Location: UK
TheHawk1973 wrote:
...My question is... on Ebay (i know..i know...) there is a Telesope with 25x,50x and 75x settings with an attachment for a DSLR.... would it work? cause his photos seem to look ok...

I can't comment on the optical qualities of the 'scope but to take minute long exposures you have to use a tracking mount which can follow the stars nd that will add to the cost.

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
PostPosted: Thu Mar 06, 2008 2:35 pm 
Bob Andersson wrote:
TheHawk1973 wrote:
...My question is... on Ebay (i know..i know...) there is a Telesope with 25x,50x and 75x settings with an attachment for a DSLR.... would it work? cause his photos seem to look ok...

I can't comment on the optical qualities of the 'scope but to take minute long exposures you have to use a tracking mount which can follow the stars nd that will add to the cost.

Bob.


Would I need that if the 'scope was an f4 or f8 ? or is that a total different meaning in 'scopes...... ?


Top
  
 
 Post subject:
PostPosted: Thu Mar 06, 2008 3:46 pm 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9833
Location: UK
Hi,

It isn't directly related to f-number but is related to focal length, declination of the star (how far away from equator) and exposure time. Have a look at this PDF file for the formula. Note that the results discussed apply to a full-frame camera (35mm) so you will need to apply the relevant crop factor.

Bob.

P.S. Yes, f-number is the same but with telescopes "aperture" is usually a measure of the diameter of the telescope's main lens (or mirror).

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Mar 06, 2008 9:13 pm 
An idea just poped up.
Imagine a telescope with a tracking mount that you can maneuver som your computer with some kind of cool program..

And then a 40D with liveview also hooked up to your computer....

Sitting indoors controlling it all :)

Now, isnt that thought cool ?


Top
  
 
 Post subject:
PostPosted: Thu Mar 06, 2008 10:17 pm 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9833
Location: UK
Hi Khol,

Absolutely warm if you are indoors. :lol: :lol: :lol:

Modern GOTO mounts can be computer controlled, usually using a (stone age) serial RS232 interface. I see no reason why one couldn't use an Ethernet/RS232 converter so allow the mount to be controlled via a long Ethernet cable. Of course the 40D can also be controlled via TCP/IP using the WFT-E3.

How do I know this? I am currently on a notification list for an Astro-Physics mounting and plan A is to do precisely that. Being UK based it might be wise to invest in a sensor to detect clouds and/or rain, though. :evil:

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Mar 08, 2008 8:02 am 
Offline
User avatar

Joined: Mon Dec 31, 2007 7:03 am
Posts: 1898
Location: Southern California
hey Bob......

what is the best "starry" photo you ever took? (and don't post a pic of that skanky Pamela Anderson.) :roll: ..for reals, what is your personal favorite, that you took...of all the Stellar shots..

thanks

patti

_________________
canon 7D, Mark iii 5D, ef 70-300 f/4-5.6, ef 28-135mm canon 100-400mm L IS 4.5, and a little 24-70 L f/2.8...
Image


Top
 Profile  
 
 Post subject:
PostPosted: Sat Mar 08, 2008 10:51 am 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9833
Location: UK
Hi patti,

Hmmm. Pamela Anderson ... barge poles ... not wanting to touch with :!: :!: :!:

My astrophotography is a bit like my normal photography in that I am far from profligate in the number of shots I take. It's almost as though "proof of concept" is enough and once done doesn't need to be repeated too often. No doubt the shrinks would have a field day with me! So I'll have to vote for my composite shot of the constellation of Orion in this post. The reason isn't because it's technically good (it isn't) but because, like many in the Northern hemisphere, it's my favourite constellation and it will never look the same again. Each winter as it becomes visible in the evening sky I'll look at it and remember how much there is to see if only our eyes were more sensitive. 8)

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Mar 08, 2008 4:15 pm 
Offline
User avatar

Joined: Mon Dec 31, 2007 7:03 am
Posts: 1898
Location: Southern California
:!: :!: :!: :!: Bob, as always the epitome of decorum..whew. I like these stars allot! The Orion ones...had no idea there were THAT many..nice to be able to see what I have been missing, all this time.

Never gave the star gazing photos a try, but they have always intrigued me..I still am light years away from that sort of thing, I think. Great shots, and I can see why you chose them. Beautiful.


patti

_________________
canon 7D, Mark iii 5D, ef 70-300 f/4-5.6, ef 28-135mm canon 100-400mm L IS 4.5, and a little 24-70 L f/2.8...
Image


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  

All words, images, videos and layout, copyright 2005-2012 Gordon Laing. May not be used without permission.
/ How we test / Best Cameras / Advertising / Camera reviews / Supporting Camera Labs

Webdesign by Alphabase IT
Powered by phpBB® Forum Software © phpBB Group